Wal-Mart Stores Inc., in a report it released Thursday, outlined dozens of ways it says it has changed over the past two years to become a more environmentally, economically and socially responsible corporate citizen.

Critics immediately challenged Wal-Mart’s assertions, pointing to their own report released in September that criticized the company’s environmental moves as insignificant or misleading, its employee pay and benefits as paltry, and its global supply chain as rife with humanrights violations...

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